LAPPD Project Test Beam Facility MC6 -7 Simulationeddata.fnal.gov/lasso/summerstudents/papers/2017/Livio-Verra.pdf · LivioVerra Italians Summer Student, Final Presentation Supervisor:

Livio VerraItalians Summer Student, Final PresentationSupervisor: Mandy RominskySeptember 27th, 2017

LAPPD ProjectTest Beam Facility MC6-7 Simulation

• Mid Term recap:– LAPPD project;– MC6 & MC7 simulation;

• Progress:– Theoretical prevision;– Simulation tricks;

• Results;

• Conclusions.

Summary

9/27/2017 Livio Verra | Italians Summer Student Final presentation2

Goal of the project is manufacturing <10 pstime resolution photodetector.

Key elements:

• Glass body, minimal feedthroughs;• MCPs made using atomic layer

deposition;• Transmission line anode;• Fast and economical front-end

electronics;• Large area, flat panel photocathode.

Large Area Picosend PhotoDetector:


• Fast source: a psec source of many photons (e.g. Cherenkov light from a charged particle traversing radiator or the entrance window of a photodetector);

• psec-level pixel-size (10-20 μm pores in MCP);• High gain: the gain has to be high enough that a single

photon triggers, i.e: the first photon “in” determines the leading edge of the pulse and consequently the timing.

Criteria for sub-psec timing:


• Time of Flight LAPPD will be tested at Fermilab Test Beam Facility so as to prove high time resolution:

• Having a precise knowledge of beam’s shape, energy, composition through experimental setup is necessary in order to position detectors in the most convenient location.

MC6 & MC7 simulations

My work:


• Main Injector provides 120 GeV/c protons in 4.2 second-spills, with approximately 60 seconds of repetition rate.

• Spills are made up of batches: 7 batches covered 11,2 μs (size of Main Injector); every batch is composed by 84 RF buckets (size of booster).

• Only the first batch over 7 has particles.

Where does FTBF receive beam from?


• The beam is transferred till M02 enclosure: it’s then split in two beams so as to deliver particles to both MTest and Mcenter.

Test Beam Facility


120GeV/cproton beam

MC6&MC7

• 120 GeV/c protons hit the copper target: then they are guided (with interaction products) along the beam line.

• MC6 provides a low-intensity beam, of a chosen mean momentum, parallel to the floor.

MC6 Structure


Cutarget

Quadrupoles

Dipoles Collimators

MC6 simulation


• Target cage;• Collimators;• Q3 quadrupoles;• Dipoles;• Q4 quadrupoles;• Trims

Simulationprogram:G4beamline(Geant4implementation)

• Mean Momentum of particles is selected by:– Momentum Collimator: it physically stops above 90 GeV/c

momentum particles (most of the beam);– Dipoles: they are all fed by the same power supply, hence they

provide the same field, set for selecting mean momentum.


2million-eventssimulation64GeV/csetup


PDGid0 500 1000 1500 2000

Ptot

[MeV

/c]

10000

15000

20000

25000

30000

35000

40000

45000

Ptot vs. PDGid

PDGid0 500 1000 1500 2000

Ptot

[MeV

/c]

20

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100

120310×

Ptot vs. PDGid

• Selecting momentum implies selecting species:


PDGid0 500 1000 1500 2000

counts

0

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PDGid

Note:electronandgammatracksarekilledforreducingsimulationrunningtime



PDGid0 500 1000 1500 2000

counts

0

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PDGid

• MC7 has calibrated instrumentation (counters, Cherenkov detectors, etc.) and can be customized for fitting experimental requirements;

• In this case, MC7 is made up of some detectors, a copper target (approximately 6 m downstream the last MC6 quad) and a collimator;

• LAPPD setup will be straight after the collimator, in the beam direction, so as to take advantage of the shielding effect.

MC7 structure


MC7 simulation


Collimator

Beam from MC6

Copper target

ToF setup

• Considering particles momentum and distance, it’s possible to calculate the system capability of solving different species;

• Couples of interest are:– π+ / μ+;– π+ / K+;– π- / e-;

• Calculations have been executed considering particles travelling in vacuum along a straight path.

Theoretical previsions:


π+ / μ+ resolution plot:


π+ / K+ resolution plot:


π- / e- resolution plot:


• 2-million-event simulation requires 12 hours running;

• Simulating one spill (~ 500 millions particles) would take 3000 hours;

• For having statistically significant results, avoiding too long running time:– Consider spatial and momentum distribution of every species

reaching the end of MC6 in 2-million-event simulation;– Proportionally calculate the number of events coming to MC7;– Run simulations equivalent to 500-million-event one.

Simulation tricks:



2millionsevents Extractinginfofromparticles

gettingthroughbothVirtualDetectors

Sendingsimulationforeachspecies,usingdistributionsgainedbefore

• Analysis code takes as input two selected Time-of-Flight VirtualDetectors and considers particles hitting both of them;

• It calculates β value using Time of Flight and position of the hit;

• It calculates error 𝚫β propagating errors on measurements:– 1 ps of time resolution;– 7 μm on transversal positions;– 8 mm on longitudinal position (thickness of the Cherenkov

glass).

Results:


8 GeV/c setup results:


beta0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1

counts

0

50

100

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beta

beta0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1

counts

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beta

beta0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1

counts

0

20

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100

beta

beta0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1

counts

0

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100

beta

5m 7.5m(usingthefirstDetector)

7.5m(thefirstTimeofFlightis7.5mapartfromthefirstDetector)

15m

beta0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1

counts

0

5

10

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beta

beta0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1

counts

0

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beta



beta0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1

counts

0

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beta

betaEntries 87Mean 0.9992RMS 0.0008304

0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 10

10

20

30

40

50

60

70beta

Entries 87Mean 0.9992RMS 0.0008304

beta

beta0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1

counts

0

2

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beta

5m


15m

7.5m(usingthefirstdetector)



beta0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1

counts

0

20

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beta

beta0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1

counts

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beta

beta0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1

counts

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beta

beta0.99 0.991 0.992 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1

counts

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beta

5m


15m

7.5m(usingthefirstdetector)

• MCenter provides a large momentum range and the possibility of having a low intensity beam;

• Choosing a low momentum setup, it’s possible to have a quite “clean” muon beam;

• Simulation results are confirmed by real historic data: it’s precise and reliable;

• The farer detectors are, the more precise measurements are, and the more ”clean” the beam is.

Conclusions:


• LAPPD Time-of-Flight setup will consist of three detectors;

• Since the beam composition and properties, and MC7 structure, the best placement will be 7.5 m of distance between detectors;

• Hence, the following configurations will be available:– 7.5 m, using detectors 1 & 2;– 15 m, using detectors 1 & 3;– 7.5 m, using detectors 2 & 3.

Conclusions:


• Database of MC6 & MC7 outlines;

• Simulation of beam lines.


Conclusion: What I gave Fermilab:

• New knowledge about particle accelerators and transfer systems;

• Taste of working in a real scientific environment;

• PATIENCE.

Conclusion: What Fermilab gave me:


Many thanks for your attention


Documents

LAPPD Project Test Beam Facility MC6 -7 Simulationeddata.fnal.gov/lasso/summerstudents/papers/2017/Livio-Verra.pdf · LivioVerra Italians Summer Student, Final Presentation Supervisor: